The spec / rating of the oil is the most important part. I can't remember what rating oil Audi are using for long life services. I think the service guy told me 508 when I visited to pick up a brake light switch. Our manuals for a B6 state 503 00 or 503 01. As long as the spec / rating is a higher number than this and the oil is *-30 you're good to go. I put a * as it wont really matter if this value is 0 or 5. The 0 one will just be a bit thinner on cold winter days at start up.